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How to prevent .ost file errors in Outlook
This article outlines the solution to the following error: "Outlook is using an old copy of your Outlook data file[.ost]. Exit outlook, delete the file, and restart Outlook. a new file will be automatically created the next time you initiate a send/receive."
Look for the Outlook symbol to be grayed out as shown below.
If the icon is there, do not try to restart the computer or force quit the application. Only after the icon disappears should one attempt to reopen Outlook. The system tray without the icon is shown below; the applications within the system tray will vary, but notice the absence of the Outlook application's icon.
Outlook will take longer to load upon reopening the application.